Answers for "how to check object is array in javascript"

if object is array javascript

Array.isArray(object);

Javascript is object array

var colors=["red","green","blue"];

if(Array.isArray(colors)){
    //colors is an array
}

check object in array javascript

var obj = {a: 5};
var array = [obj, "string", 5]; // Must be same object
array.indexOf(obj) !== -1 // True